html{
    background-color: #606060;
}
.container {
    width: 794px;
    margin: 0 auto;
}
.header{
    background-color: #39393a;
    color: #fff;
    font-family: 'pingfang-sc' !important;
    -webkit-text-size-adjust: none;
    line-height: 1.904;
}
.header h1 {
    font-family: 'pingfang-sc' !important;
    border-bottom: 1px solid #ddd;
    padding: 10px 0;
    font-size: 28px;
    margin: 0;
    margin: 0 50px;
    color: #fff;
    font-weight: 900;
}
.header-container {
    display: flex;
}
.header .left, .header .right {
    padding-top: 10px;
    padding-bottom: 10px;
}

.header .left {
    flex: auto;
    text-align: left;
}
.header .right {
    flex: auto;
    flex-shrink: 0;
    text-align: right;
}
.container p {
    position: relative;
    overflow: hidden;
    margin-left: 50px;
    margin-right: 50px;
    margin-bottom: 0px;
    font-size: 14px;
}
.header a {
    color: #d4d4d4;
    text-decoration: none;
    background-color: transparent;
    outline: none;
    cursor: pointer;
    -webkit-transition: color .3s;
    transition: color .3s;
    -webkit-text-decoration-skip: objects;
}
svg:not(:root) {
    overflow: hidden;
}
.icon {
    fill: #fff;
    vertical-align: middle;
}

.h2_block {
    padding-top: 20px;
    padding-bottom: 20px;
    color: #000;
    background: #fff;
    margin-top: -1px;
}
.block::before {
    display: block;
    content: "";
    height: 0;
    clear: both;
}
h2 {
    position: relative;
    z-index: 1;
    padding: 0;
    width: 180px;
    margin: 0px auto 0px;
    border-radius: 32px;
    text-align: center !important;
    background-color: #eee;
    font-size: 16px;
    margin-bottom: 5px !important;
    font-weight: 700;
    color: rgba(0,0,0,.85);
    line-height: 2;
}
h2::before {
    content: "";
    width: calc((794px - 50px * 2 - 180px - 20px * 2) / 2);
    position: absolute;
    top: 50%;
    height: 0;
    right: calc(100% + 20px);
    border-top: 1px solid #ededed;
}
h2::after {
    content: "";
    width: calc((794px - 50px * 2 - 180px - 20px * 2) / 2);
    position: absolute;
    top: 50%;
    left: calc(100% + 20px);
    right: 0;
    border-top: 1px solid #ededed;
}
.h3_block {
    padding: 0 0 5px;
}
h3 {
    padding: 2.5px 0;
    font-size: 15px;
}

h3 {
    position: relative;
    overflow: hidden;
    margin-left: 50px;
    margin-right: 50px;
    font-weight: 600;
}
code {
    line-height: 1.5715;
    padding: 1px 6px;
    display: inline-block;
    color: #333;
    border-radius: 4px;
    margin-bottom: 4px;
    background-color: rgba(27,31,35,0.05);
    word-break: break-all;
    font-size: 13px;
}
ul {
    margin: 0 50px;
}
ul {
    padding-left: 1.3em;
    overflow: hidden;
}
ul li {
    list-style-type: square;
    list-style-position: outside;
    display: list-item;
    text-align: -webkit-match-parent;
}

ul li ul,ul li ol {
    margin: 0 10px;
}
li ul li {
    padding-left: 1px;
    list-style-type: circle;
    list-style-position: outside;
    line-height: 2;
}
用户代理样式表
.first {
    list-style-type: disc!important;
    list-style-position: outside;
}
.flexbox{
    display: flex;
    justify-content: space-between;
}
.flexbox a{
    text-decoration: none;
    background-color: transparent;
    outline: none;
    cursor: pointer;
}